On Fri, Dec 02, 2016 at 11:17:35AM +0100, Hans de Goede wrote: > The primary consumer of the lpss pwm is the i915 kms driver, but > currently that driver cannot get the pwm because i915 platforms are > not using devicetree and pwm-lpss does not call pwm_add_table. > > Another problem is that i915 does not support get_pwm returning > -EPROBE_DEFER and i915's init is very complex and this is almost > impossible to fix. > > This commit changes the PWM_LPSS Kconfig from a tristate to a bool, so > that when the i915 driver loads the lpss pwm will be available avoiding > the -EPROBE_DEFER issue. Note that this is identical to how the same > problem was solved for the pwm-crc driver. > > Being builtin also allows calling pwm_add_table directly from the > pwm-lpss code, otherwise the pwm_add_table call would need to be put > somewhere else to ensure it happens before i915 calls pwm_get, > even if i915 would support -EPROBE_DEFER. > > Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx> > --- > drivers/pwm/Kconfig | 12 +++--------- > drivers/pwm/pwm-lpss.c | 11 +++++++++++ > 2 files changed, 14 insertions(+), 9 deletions(-) This is completely backwards. You're putting board-specific bits into a generic driver. And no, this is not the same as pwm-crc because the board-specific bits went into the MFD driver. I don't like that very much either, but there is documentation that suggests that the Crystal Cove PMIC is used on a single platform, whereas there's no such evidence for LPSS. Why can't you just add something to drivers/platform/x86 to register the table? You could base that on some kind of identifier (ACPI, DMI, ...) to only do so if necessary. I could probably live with making this builtin, but your justification sounds like a bit of a lame excuse rather than a good technical reason. Thierry
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